Where is the inlet for the air conditioning coolant?

sounds about right ,but never seen this car here in spain ...

Your thermostat may be stuck open and your coolant isn't getting hot to warm the cab.Here's a link on how to replace,very easy to do.Don't let your pets near spilt coolant,will kill them.

you need to chase it from your compressor in the engine. there are two ports, an inlet and outlet. i have a 2002 impala and it took me a few hours to find it. it was hiding under my coolant resevoir. the ports have a black screw cap on them

REMOVAL & INSTALLATION The thermostat's purpose is to control the flow into the engine from the radiator. During warm up, the thermostat remains closed so that the coolant within the engine heats quickly and aids the warming up process. As the coolant temperature increases, the thermostat gradually opens, allowing a supply of lower temperature coolant (from the radiator) to enter the water pump and circulate through the engine. NOTE: A thermostat should never be removed as a countermeasure to overheating problems. This will only decrease the cooling system efficiency and add to the problem. The vehicle cooling system should be serviced with necessary components replaced.

1. Drain the cooling system and save the coolant for reuse.
2. Remove the water inlet housing (disconnect any electrical connections on the housing) and remove the thermostat. Carefully observe the positioning of the thermostat within the housing before removal.
3. Install the new thermostat in the housing, making sure it is in correctly. It is possible to install it backwards. Additionally, make certain that the air bleed valve aligns with the protrusion on the water inlet housing. Failure to observe this placement can result in poor air bleeding and possible overheating.
4. Install the water inlet housing cover with a new gasket. Install the two hold-down bolts and torque to 43 inch lbs. (4.9 Nm). Do not overtighten these bolts!
5. Refill the cooling system with coolant.
6. Start the engine. During the warm up period, observe the temperature gauge for normal behavior. Also during this period, check the water inlet housing area for any sign of leakage. Remember to check for leaks under both cold and hot conditions. Fig. 1: Always observe the positioning of the thermostat in the housing before removing it
   Fig. 2: The thermostat should be installed with the jiggle valve upwards
   

Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005 Water Pump - Removal & Installation 4.8L, 5.3L & 6.0L Engines

1. Remove or disconnect the following:
   Air outlet duct Coolant Inlet radiator hose from the water pump Upper fan shroud Cooling fan and clutch assembly Drive belt Radiator outlet hose from the coolant pump Surge tank hose Heater hose Water pump
   
   
   Fig. Exploded view of the water pump assembly-4.8L, 5.3L and 6.0L engines
   

To install:

NOTE DO NOT use cooling system seal tabs (or similar compounds) unless otherwise instructed. The use of cooling system seal tabs (or similar compounds) may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

1. Install or connect the following:
   Water pump. Install the water pump bolts. Tighten the water pump bolts first pass to 11 ft. lbs. (15 Nm); tighten the bolts final pass to 22 ft. lbs. (30 Nm). Water pump drive belt pulley and bolts (if applicable). Tighten the pulley bolts first pass to 89 inch lbs. (10 Nm); tighten the bolts final pass to 18 ft. lbs. (25 Nm). Surge tank hose Heater hose Outlet radiator hose to the coolant pump Drive belt Cooling fan and clutch assembly Upper fan shroud Inlet radiator hose to the water pump Air inlet duct Coolant

1. Remove or disconnect the following:
   Air inlet and outlet duct Coolant Inlet radiator hose from the water pump Upper fan shroud Cooling fan and clutch assembly Drive belt Radiator outlet hose from the coolant pump Surge tank hose Heater hose Water pump
   
   

To install:

1. Install or connect the following:
   Water pump. Install the water pump bolts. Tighten the bolts to 11 ft. lbs. (15 Nm) for the first pass; then tighten to 22 ft. lbs. (30 Nm) for the final pass. Water pump drive belt pulley and bolts (if applicable). Tighten the bolts to 89 inch lbs. (10 Nm) for the first pass; then tighten to 18 ft. lbs. (25 Nm) for the final pass. Surge tank hose Heater hose Outlet radiator hose to the coolant pump Drive belt Cooling fan and clutch assembly Upper fan shroud Inlet radiator hose to the water pump Air inlet and outlet duct Coolant

Hope this help to solve it (remember comment and rated this).

If you have a "Air pump installed on your TB then you need to replace pump and or check to make sure that the hose's are all connect to it prior to replacing the pump which is dependisng on which engine you have on the lower left side (passenger)
Models Affected
1999-2003 Chevrolet Blazer, S10
1999-2001 GMC Jimmy
1999-2003 GMC Sonoma
1999-2001 Oldsmobile Bravada
All with 2.2L or 4.3L Engine (VINs 4, H, 5, W -- RPOs LN2, L43, L35)
Condition
Some owners may comment on the check engine light being illuminated. Upon
investigation, the technician may find a DTC P0410 indicating there is a concern in the
secondary air injection system.
Cause
This concern may be attributed to water that may have collected in the AIR pump or the
vent solenoid and frozen or corroded the pump.
Correction
Replace the AIR pump and install a new inlet hose and solenoid tube assembly using
the following procedure:
1. Prep vehicle.
2. Raise vehicle on hoist.
3. Remove shield covering AIR pump.
4. Remove hose and vacuum lines from pump and solenoid.
5. Remove AIR pump inlet hose. Do not re-use.
6. Disconnect electrical connectors from pump and solenoid.
7. Remove pump mounting bolts and pump.
8. Transfer isolators from the old pump to the new pump.
9. Install new AIR pump and bolts to vehicle. Tighten the bolts to 17N·m (12.5 lb ft).
10. Route new hose assembly up between engine and fender. It should come up near
the area between the battery and the coolant bottle.
11. Connect new inlet hose to pump inlet.
12. Connect old outlet hose to pump outlet.
13. Connect electrical connector to pump.
14. Connect electrical connector for solenoid to connector on the new hose assembly.
15. Connect the hose with the white nipple to the vacuum source hose.
16. Connect the remaining hose to the shut off valve.
17. Install shield covering AIR pump.
18. Lower vehicle.
19. Remove coolant reservoir nut nearest the battery.
20. Route new hose assembly between the battery and the coolant reservoir with the solenoid on top.
21. Install the solenoid bracket onto the coolant reservoir stud and reinstall the nut
back into the vehicle.
22. Use a wire tie to keep the new hose assembly away from the engine. On four
cylinder engines, tie to the AIR outlet hose. On six cylinder engines, tie to an
available hole in the radiator fan shroud.
Part Information
Part Number Description Quantity

Removal & Installation
CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

1. Drain the radiator and recycle the engine coolant.
   
2. Remove the upper radiator hose bracket bolt and remove the bracket.
   
3. On 1993–98 3.0L engine models:
   
   • Remove the bolt from the A/C high pressure line bracket at the front of the engine.
     
   • Remove the two A/C accumulator/drier bracket bolts.
     
   • Position the accumulator/drier and A/C line out of the way.
     
4. Remove the bypass hose clamp and remove the hose from the water inlet.
   
5. Remove the four water inlet bolts and remove the inlet.
   
6. Remove the thermostat from the inlet.
   

To install:

1. Clean and dry the water inlet and thermostat housing mating surfaces.
   
2. Apply a continuous bead of RTV silicone sealant 0.08–0.12 inch (2.0–3.0mm) wide to the water inlet mating surface.
   
   NOTE The water inlet must be installed within 5 minutes of applying the sealant.
   
   
3. Install the thermostat in the water inlet, with the jiggle valve at the topmost (12 o’clock) position.
   
4. Install the water inlet to the thermostat housing. Install the bolts and tighten them to 12–15 ft. lbs. (16–21 Nm).
   
5. Install the bypass hose to the water inlet, using a new clamp.
   
6. On 1993–98 3.0L engine models:
   
   • Install the accumulator/drier and tighten the bracket bolts to 45 inch lbs. (5 Nm).
     
   • Install the A/C high pressure line bracket and tighten the bolt to 45 inch lbs. (5 Nm).
     
   • Install the upper radiator hose bracket and tighten the bolt to 34–48 ft. lbs. (46–65 Nm).
     
     NOTE Allow the sealant to dry for at least 30 minutes before adding coolant.
     
     
7. Fill the cooling system. Run the engine and check for leaks.
   

Thermostat water inlet sealant application




Proper installation of the thermostat in the thermostat inlet

Thermostat

• REMOVAL & INSTALLATION

REMOVAL & INSTALLATION

All Models
See Figures 1 and 2
The thermostat and its built-in by-pass valve is installed on the inlet side of the water pump. Its purpose is to prevent overheating of the coolant by controlling the flow into the engine from the radiator. During warm up, the thermostat remains closed so that the coolant within the engine heats quickly and aids the warming up process.
As the coolant temperature increases, the thermostat gradually opens, allowing a supply of lower temperature coolant (from the radiator) to enter the water pump and circulate through the engine.

WARNING A thermostat with an internal by-pass should never be removed as a countermeasure to overheating. Removing the thermostat actually makes the problem worse because more coolant bypasses the radiator, thereby reducing cooling even more.

1. Drain the cooling system and save the coolant for reuse.

CAUTION When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

1. Remove the water inlet housing and remove the thermostat. Carefully observe the positioning of the thermostat within the housing.

Fig. Fig. 1: Thermostat assembly. Prizm shown, Nova similar

1. Install the new thermostat in the housing, making sure it is in correctly. It is possible to install it backwards. Additionally, make certain that the air bleed valve aligns with the protrusion on the water inlet housing. Failure to observe this placement can result in poor air bleeding and possible overheating.

Fig. Fig. 2: Correct placement of the air bleed valve during thermostat replacement

1. Install the water inlet housing cover with a new gasket. Install the 2 hold down bolts and tighten them to 20 ft. lbs. Do not overtighten these bolts!
2. Refill the cooling system with coolant.
3. Start the engine. During the warm up period, observe the temperature gauge for normal behavior. Also during this period, check the water inlet housing area for any sign of leakage. Remember to check for leaks under both cold and hot conditions.

Please convert to the new one. It's a lot better and cheaper to maintain.

run the engine with the ac on.  It's the cooler valve and line.  which is the low or suction side.